ltt/branches/poly/include/ltt/time.h

   1 #ifndef LTT_TIME_H
   2 #define LTT_TIME_H
   3
   4
   5 typedef struct _LttTime {
   6   unsigned long tv_sec;
   7   unsigned long tv_nsec;
   8 } LttTime;
   9
  10
  11 static const unsigned long NANOSECONDS_PER_SECOND = 1000000000;
  12
  13 static const LttTime ltt_time_zero = { 0, 0};
  14
  15
  16 static inline LttTime ltt_time_sub(LttTime t1, LttTime t2)
  17 {
  18   LttTime res;
  19   res.tv_sec  = t1.tv_sec  - t2.tv_sec;
  20   if(t1.tv_nsec < t2.tv_nsec) {
  21     res.tv_sec--;
  22     res.tv_nsec = NANOSECONDS_PER_SECOND + t1.tv_nsec - t2.tv_nsec;
  23   }
  24   else {
  25     res.tv_nsec = t1.tv_nsec - t2.tv_nsec;
  26   }
  27   return res;
  28 }
  29
  30
  31 static inline LttTime ltt_time_add(LttTime t1, LttTime t2)
  32 {
  33   LttTime res;
  34   res.tv_sec  = t1.tv_sec  + t2.tv_sec;
  35   res.tv_nsec = t1.tv_nsec + t2.tv_nsec;
  36   if(res.tv_nsec >= NANOSECONDS_PER_SECOND) {
  37     res.tv_sec++;
  38     res.tv_nsec -= NANOSECONDS_PER_SECOND;
  39   }
  40   return res;
  41 }
  42
  43
  44 static inline LttTime ltt_time_mul(LttTime t1, float f)
  45 {
  46   LttTime res;
  47   float d;
  48   double sec;
  49
  50   if(f == 0.0){
  51     res.tv_sec = 0;
  52     res.tv_nsec = 0;
  53   }else{
  54     d = 1.0/f;
  55     sec = t1.tv_sec / (double)d;
  56     res.tv_sec = sec;
  57     res.tv_nsec = t1.tv_nsec / (double)d + (sec - res.tv_sec) *
  58                   NANOSECONDS_PER_SECOND;
  59     res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND;
  60     res.tv_nsec %= NANOSECONDS_PER_SECOND;
  61   }
  62   return res;
  63 }
  64
  65
  66 static inline LttTime ltt_time_div(LttTime t1, float f)
  67 {
  68   double sec;
  69   LttTime res;
  70
  71   sec = t1.tv_sec / (double)f;
  72   res.tv_sec = sec;
  73   res.tv_nsec = t1.tv_nsec / (double)f + (sec - res.tv_sec) *
  74       NANOSECONDS_PER_SECOND;
  75   res.tv_sec += res.tv_nsec / NANOSECONDS_PER_SECOND;
  76   res.tv_nsec %= NANOSECONDS_PER_SECOND;
  77   return res;
  78 }
  79
  80
  81 static inline int ltt_time_compare(LttTime t1, LttTime t2)
  82 {
  83   if(t1.tv_sec > t2.tv_sec) return 1;
  84   if(t1.tv_sec < t2.tv_sec) return -1;
  85   if(t1.tv_nsec > t2.tv_nsec) return 1;
  86   if(t1.tv_nsec < t2.tv_nsec) return -1;
  87   return 0;
  88 }
  89
  90
  91 static inline double ltt_time_to_double(LttTime t1)
  92 {
  93   return (double)t1.tv_sec + (double)t1.tv_nsec / NANOSECONDS_PER_SECOND;
  94 }
  95
  96
  97 static inline LttTime ltt_time_from_double(double t1)
  98 {
  99   LttTime res;
 100   res.tv_sec = t1;
 101   res.tv_nsec = (t1 - res.tv_sec) * NANOSECONDS_PER_SECOND;
 102   return res;
 103 }
 104
 105 #endif // LTT_TIME_H